Inheritance Chapter 7
Inheritance:  the way genes are passed down. <ul><li>If a father doesn’t have a leg does that mean his children will be bo...
Hundreds of years ago people knew that somehow certain traits would be passed on to their children .
Gregor Mendel was the first to predict the outcome of inheritance.  The study of inheritance is Genetics .
<ul><li>Mendel did several different experiments on pea plant. </li></ul><ul><li>This is an example of wrinkled and smooth...
Genes and Alleles <ul><li>A gene is a specific piece of DNA. </li></ul><ul><li>You have two genes that code for the same t...
Why two alleles for every gene? <ul><li>Because organisms get 2 sets of chromosomes ……….one from the mother and one from t...
Phenotype <ul><li>Is the physical characteristics of the trait. </li></ul><ul><li>In most cases it is what we can “see”. <...
Genotype <ul><li>Is the actual alleles that make up the trait.  </li></ul><ul><li>In most all cases this is represented by...
Dominant  <ul><ul><li>A dominant trait is a trait that covers or hides the other trait of an allele. </li></ul></ul><ul><l...
Recessive <ul><li>A recessive trait is the trait that is hidden by the dominant trait. </li></ul><ul><li>In an animal with...
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Inheritence

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Inheritence

  1. 1. Inheritance Chapter 7
  2. 2. Inheritance: the way genes are passed down. <ul><li>If a father doesn’t have a leg does that mean his children will be born with out a leg???? </li></ul>
  3. 3. Hundreds of years ago people knew that somehow certain traits would be passed on to their children .
  4. 4. Gregor Mendel was the first to predict the outcome of inheritance. The study of inheritance is Genetics .
  5. 5. <ul><li>Mendel did several different experiments on pea plant. </li></ul><ul><li>This is an example of wrinkled and smooth seeds. </li></ul>
  6. 6. Genes and Alleles <ul><li>A gene is a specific piece of DNA. </li></ul><ul><li>You have two genes that code for the same thing (ex. Height). Each of those two genes is called an allele. </li></ul><ul><li>So if something had the genes Aa one allele would be “A” the other would be “a”). </li></ul>
  7. 7. Why two alleles for every gene? <ul><li>Because organisms get 2 sets of chromosomes ……….one from the mother and one from the father. </li></ul>
  8. 8. Phenotype <ul><li>Is the physical characteristics of the trait. </li></ul><ul><li>In most cases it is what we can “see”. </li></ul><ul><li>Example: Freckles, dimples, attached earlobes etc. </li></ul>
  9. 9. Genotype <ul><li>Is the actual alleles that make up the trait. </li></ul><ul><li>In most all cases this is represented by 2 letters. </li></ul><ul><li>Example: AA, Aa, aa </li></ul>
  10. 10. Dominant <ul><ul><li>A dominant trait is a trait that covers or hides the other trait of an allele. </li></ul></ul><ul><li>For example, dark colors in hair usually overshadow the other allele. </li></ul><ul><li>In this class Dominant will always be represented with a capital letter. </li></ul><ul><li>Example: Say “D” is the allele for black hair and “d” is the allele for blond. The if an animal had Dd then it would have black hair. </li></ul>
  11. 11. Recessive <ul><li>A recessive trait is the trait that is hidden by the dominant trait. </li></ul><ul><li>In an animal with Dd for hair color the recessive allele is “d”. </li></ul><ul><li>The animal carries a gene for blond hair but you can’t tell by looking at it. </li></ul>
  12. 12. The End
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